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Pretty sure it's a VW. In that case it's probably for city lights in Europe market cars. I forget how they differ, but they're similar to our parking lights. Either that, or just a cosmetic thing to make the headlights look cooler.
A friend of mine has a VW GTI. In Europe it has a rear fog light (just makes the left taillight extra bright). It's not an option in the USA, but his was prewired for it. He just plugged in the factory switch and it worked right away.
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